[llvm-dev] Example of using RGPassManager?

[Zhang via llvm-dev]

Hi:
My pass needs to run on LLVM Regions, I'm currently using the following code
```
RGPassManager RPM;
RPM.add(createRegionPrinterPass());
RPM.doInitialization(M);
for (Function &func : M.functions()) {
  RPM.runOnFunction(func);
}
RPM.doFinalization(M);

```


However when adding the pass, it asserts with PMTopLevelManager::findAnalysisUsage due to top level pass manager is null


Zhang
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